The tattoos are temporary and usually last two to three weeks before fading. However, the time it takes for the tattoo to disappear depends on where it's located on the body.
Areas that are frequently exposed to soap, water, and sunlight – like your hands – will fade more quickly. Covered areas should stay fresh for much longer.
You can also make your henna tattoo last longer by ensuring your skin is thoroughly exfoliated and shave before applying it. That means you won't be applying the henna ink to dead skin.